Local Korean numbers as CLI are forbidden to be used to send traffic towards South Korea.
In South Korea, it is not allowed to add “+” sign
When you call from overseas, caller should see int’l telephony carrier’s prefix + calling number
e;g if US number 14155551212 is calling a SK number, CLI added with a prefix and show up as
Prefix for different Carriers(KT 001 / LGU 002 / SK Telink 006)
Other features/restrictions of note: